Delegate help for Func<T, TResult> declaration

  • Thread starter Thread starter Schizoid Man
  • Start date Start date
S

Schizoid Man

Hello,

I have the following piece of code that uses a one-dimensional root solver
for solve for a particular value. I've currently got this code working by
using a generic public delegate double FX(double x);.

The code looks like:

public static void Main (string[] args)
{
Bond james;
james = new Bond(0.10, 2, 5); // Create a bond - this
constructor forces yield and price of zero
james.BondPrice = 50; // Set the bond price
FX f = delegate(double x)
{
james.BondYield = x;
return (BondPricer.CalcBondPrice(james) - james.BondPrice);
};
double ans = NewtonMethod.DoSolve(f);
Console.WriteLine("Root: {0}", ans);
Console.ReadLine();
}

Could someone give me some tips on how I could convert this using the Func<>
delegate type? I'm interested in writing a couple of other solver classes
and want to keep the delegate declaration as generic as possible (since I'll
be using this to solve for a variety of functions).

Thanks.
 
Hello,

I have the following piece of code that uses a one-dimensional root solver
for solve for a particular value. I've currently got this code working by
using a generic public delegate double FX(double x);.

The code looks like:

 public static void Main (string[] args)
        {
            Bond james;
            james = new Bond(0.10, 2, 5);  // Create a bond - this
constructor forces yield and price of zero
            james.BondPrice = 50; // Set the bond price
            FX f = delegate(double x)
            {
                james.BondYield = x;
                return (BondPricer.CalcBondPrice(james) -james.BondPrice);
            };
            double ans = NewtonMethod.DoSolve(f);
            Console.WriteLine("Root: {0}", ans);
            Console.ReadLine();
        }

Could someone give me some tips on how I could convert this using the Func<>
delegate type? I'm interested in writing a couple of other solver classes
and want to keep the delegate declaration as generic as possible (since I'll
be using this to solve for a variety of functions).

Thanks.
Click to expand...

your delegate definition is Func<T> but having T as double. I do not
see why you want to change it. you cannot use Func as it accept things
like string, which you have no use for.
 
Peter Duniho said:
[...]
Could someone give me some tips on how I could convert this using the
Func<> delegate type? I'm interested in writing a couple of other solver
classes and want to keep the delegate declaration as generic as possible
(since I'll be using this to solve for a variety of functions).
Click to expand...

In this example, the use of Func<T> isn't about making the code
_generic_. It's simply about using a pre-existing type instead of
declaring one yourself.

You can replace "FX" with "Func<double>" in the code (in the DoSolve()
argument list, and the Main() method, and anywhere else it appears). That
will allow you to not have to declare the "FX" type.
Click to expand...

Thanks, Peter. I just realized that I am on VS 2005, so not sure this will
work.
 
Peter Duniho said:
In this example, the use of Func<T> isn't about making the code
_generic_. It's simply about using a pre-existing type instead of
declaring one yourself.

You can replace "FX" with "Func<double>" in the code (in the DoSolve()
argument list, and the Main() method, and anywhere else it appears). That
will allow you to not have to declare the "FX" type.
Click to expand...

Thanks, Peter. I managed to get the code working using the predefined
delegate types, though frankly I think it makes the code less legible.

I think I prefer to use my own non-generic type.
 
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